Twin-scroll turbochargers promise to increase low-end torque, improve boost response, raise power throughout the powerband, maximize turbine efficiency, reduce engine pumping losses, improve fuel economy, decrease intake charge dilution during valve overlap and lower exhaust gas temperatures.

Is a twin-scroll turbo better?

Twin-scroll turbochargers are better in nearly every way than single-scroll turbos. By using two scrolls, the exhaust pulses are divided. For example, on four cylinder engines (firing order 1-3-4-2), cylinders 1 and 4 might feed to one scroll of the turbo, while cylinders 2 and 3 feed to a separate scroll.

What Does a twin-scroll turbo mean?

It means you have the power of two turbocharged engines contained in one SUBARU BOXER engine!